A newspaper clipping names Clifford Soubier's character as Michael F. Grogan. However the letter earlier refers to him as Michael P. Grogan.
When Bogie begins begging Foran not to go to the police, Bogie's pack of cigarettes disappears from his shirt pocket.
When Bogie squats down to talk to his son in his baseball uniform, the boy's top button buttons itself.
The glasses on the edge of the table disappear when Sheridan and Foran leave the booth.
When Bogie gets home with his new car, the side of the house changes from shaded to full sun.
When Frank tosses Ed's lunchbox to him, it has an empty, metallic sound.
The radio announcer makes the common mistake of saying "Klu" Klux Klan (rather than Ku).
The movie end credits list the name of the character played by Helen Flint as "Pearl Davis" but throughout the movie - particularly during her courtroom testimony - her character is referred to as "Pearl Danvers."
When Bogart goes to his first black legion meeting he asks the drug store owner if Cliff Summers is there. The character's name is Cliff Moore.